Senior Back-End Developer (FinTech / Start-up) Hyre AI is hiring for a Senior Back-end Software Developer on behalf of a fast-paced, ambitious early startup based in London, on a mission to rid the world of scams. If you’re excited by impactful work, solving tough problems, and wearing a few different hats along the way, then this role might just be for you Skills & Experience You'll Need: Experience: Ideally, you’ve earned your skills through 5 years of experience, working on strategic, hands-on projects and managing your workload independently. Programming Languages: You’re an experienced back-end engineer, though have a breadth of understanding across the development lifecycle. Our clients are tech agnostic - the tools you’ve used before matters less than your ability to choose the right one for the task. However, we would value languages including Java, Python, Rust, Go, and Scala - though this list is not exhaustive, and we don't expect candidates to have experience with all of them. Infrastructure: You’ve worked with cloud tools such as Docker, Kubernetes, Terraform, and Helm, as well as cloud providers like AWS or GCP. Security: You’re familiar with best practices for safeguarding against vulnerabilities like injections, XSS, CSRF. You believe security is a priority from day one. Accessibility: You design with inclusivity in mind, and build systems that work for everyone, regardless of ability. Industry Knowledge: Fintech or banking is a strong plus, however we’re also keen on hearing from candidates who’ve worked on large-scale systems handling sensitive data in any industry. What You’ll Be Doing: Building scalable, robust, and well-tested backend services that integrate with customers’ systems to fight scams effectively. Designing and implementing elegant, intuitive and scalable RESTful APIs. Taking part in shaping our client's technical and cultural foundations—whether it’s setting standards, choosing tools, reviewing code, or fostering collaboration. Championing security best practices and ensuring sensitive data is handled with care. Diving into any and all parts of the stack alongside the backend as needed, e.g. infrastructure, data, front-end. Setting up and maintaining automated testing and CI/CD pipelines to ensure high-quality, seamless deployments. Location: This role is based in Covent Garden, London, 3-days per week on-site